Larry Birkhead and OK! Magazine No Longer BFFs

Larry Birkhead and OK! Magazine are no longer playing nice with each other. Anna Nicole Smith's ex and father of her daughter Dannielynn have been BFFs since they cut an "exclusive" deal with him during his custody battle with Howard K Stern.

The magazine was expected to run pictures of Dannielynn's first birthday party, but has pulled out due to "explosive allegations."

"Newly obtained allegations are detailed, shocking and potentially incriminating. Furthermore, it makes it impossible for OK!, in good conscience, to promote this family’s highly questionable relationship in our pages. Next week's issue of OK! will bring all of the unfortunate, relevant details to light," according to editor in chief Sarah Ivens.

She adds: "It breaks my heart that OK! has to pull out of a shoot that would have chronicled the next great chapter of Dannielynn's life. That sort of celebration is what the magazine enjoys most. But first and foremost, we—and I—care dearly about the well-being of the young one, and my moral obligation lies with her. So, it's unfortunate, but at the moment, my biggest fear is that Larry and Howard may have tricked us all."

For his part, Birkhead says the allegations are based on an upcoming book by Rita Cosby, and that he is planning plans to sue both Cosby and the magazine.

He tells TMZ that the current smear campaign is due to Us Weekly recently featuring Dannielynn on its cover. OK! had previously paid him $1.7 million for an exclusive four-part series.